If the sands are relatively clean (less than 15% fines), I would recommend that you compact the upper 12 inches of bearing soils to 95% ASTM D1557 (Modified Proctor) density. Perform density tests to confirm acceptable compaction. Dewater prior to compacting the soil, if necessary. If the soils possess more than about 15% fines (but less than 25 to 30%), use a Standard Proctor compaction criteria (ASTM D698) instead.